JP2003338033A - Magnetic tape manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve productivity and product quality by equalizing the tension of individual magnetic tapes to a desired value in manufacture of the magnetic tapes. <P>SOLUTION: While pulling out the rolled material 20 of a magnetic tape in the state of a wide belt wound like a roll from a feeding side and transporting it, the magnetic tape manufacturing apparatus allows a slitter 14 to cut the original member into a plurality of narrow magnetic tapes 26 and rolls them up onto a winding stem 17 on a rolling side through a magnetic tape transportation means 60. A plurality of roller members 22, 22, etc., internally equipped with eddy current type clutches 80 are mounted on one or more of the spindles 23 of the magnetic tape transportation means 60 to control the tension of the magnetic tapes in the middle of transportation by controlling the rotation of the spindles. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape manufacturing apparatus, and more particularly to a magnetic tape manufacturing apparatus for computer data backup including cassette tapes and video tapes. About. 2. Description of the Related Art Various types of magnetic tapes, such as cassette tapes and video tapes, which are also used for computer data backup, are made of a wide belt-shaped magnetic tape wound in a roll shape. It is manufactured by cutting into a plurality of narrow magnetic tapes with a slitter while being drawn out from the delivery side and transported, and wound around a winding core. Conventionally, a slitter used in the manufacture of such a magnetic tape is a device that cuts a wide and strip-shaped magnetic tape into a plurality of magnetic tapes by a pair of upper and lower rotary blades. In general, it is composed of a plurality of rotary blades formed in a shape, and a plurality of thin disk-shaped rotary blades that cut by applying a shearing force to the original magnetic tape between the rotary blades. In order to improve the winding shape in the winding process for manufacturing this magnetic tape original fabric, the magnetic tape original fabric used for manufacturing such a magnetic tape has a roll center which is more than the thickness at both ends of the roll. It is wound into a medium-high roll shape with a thick part. That is, in the original magnetic tape before being cut into a plurality of magnetic tapes, the outer diameter of the roll center is larger than the outer diameter of both ends of the roll. If this magnetic tape is cut into a plurality of magnetic tapes with a slitter, the length of the magnetic tape taken from the center of the roll is different from the length of the magnetic tape taken from both ends of the roll. The slack of the magnetic tape or the extreme tension of the magnetic tape is generated. As a result, problems such as poor running of the magnetic tape due to sagging of the magnetic tape, and problems such as variations in the tape width of the magnetic tape product due to the pulling of the magnetic tape may occur. Similarly, a cleaning means equipped with a polishing head is often provided in the magnetic tape transport path, but when the tension of the magnetic tape varies,
It has also been pointed out that wear of a polishing head that comes into contact with a magnetic tape having a low tension is likely to be promoted, resulting in problems. However, the tension control of the magnetic tape by the guide roller used in the conventional magnetic tape manufacturing apparatus is performed by one guide roller (for example, a grooved suction drum) for a plurality of magnetic tapes. It was. For this reason, it has been insufficient for solving the above problems. On the other hand, for example, JP-A-200200
As disclosed in Japanese Laid-Open Patent Publication No. 1-187660, a proposal has been made to reduce the tension blocking ability to make the tension of the upstream magnetic tape different from the tension of the downstream magnetic tape.
And by such a means, it is supposed that it can reduce that the above malfunctions arise. However, even if various conventionally known means are employed, it is difficult to make the tension of each magnetic tape completely uniform, which is caused by slack of the magnetic tape. The concern about the failure still has not been resolved. The present invention has been made in view of such circumstances, and in the manufacture of a magnetic tape which is cut from a magnetic tape raw material into a plurality of narrow magnetic tapes and wound on a winding core. Even if there is variation in the length of the cut magnetic tape, the tension applied to each magnetic tape is kept constant.
It is an object of the present invention to provide a magnetic tape manufacturing apparatus capable of improving productivity and product quality by controlling the tension to a desired value. In order to achieve the above object, the present invention comprises a tape supply means for pulling out a wide strip-shaped magnetic tape wound in a roll shape from a delivery side, and A slitter that cuts the original magnetic tape into a plurality of narrow magnetic tapes, a tape winding unit that individually winds the magnetic tape around a winding core, and a gap between the slitter and the tape winding unit. A magnetic tape transport device that guides the magnetic tape to the tape take-up means while being supported by a roller member mounted on a support shaft. A plurality of roller members having an eddy current clutch are mounted on at least one of the support shafts of the means, and the rotation of the support shaft is controlled. By this, the tension | tensile_strength of the magnetic tape in conveyance is controllable, The magnetic tape manufacturing apparatus characterized by the above-mentioned is provided. According to the present invention, at least one of the support shafts of the magnetic tape conveying means provided between the slitter and the tape take-up means is mounted with a plurality of roller members that incorporate an eddy current clutch. Since the tension of each magnetic tape being transported can be controlled, the tension of each magnetic tape can be made uniform to stabilize and improve productivity and product quality, and to improve the yield. it can. Furthermore, according to the present invention, a drive source (for example, a motor) is not required, and a space required for the wiring is not required, resulting in an advantage that space saving can be achieved. DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a magnetic tape manufacturing apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. A magnetic tape manufacturing apparatus 10 according to the present invention shown as an example in FIG. 1 mainly includes a tape supply means 13 for pulling out a wide belt-shaped magnetic tape 20 wound in a roll shape from the feed side. The slitter (cutting device) 14 for cutting the magnetic tape 20 into a plurality of narrow magnetic tapes 26 and the magnetic tape 26 are individually wound on the hub 18 (core) of the winding reel 17 on the winding side. It is provided between the tape take-up means 50, the slitter 14 and the tape take-up means 50, and guides to the tape take-up means 50 while supporting each magnetic tape 26 by the roller members 22, 22,. And a magnetic tape transport means 60. FIG. 2 is a schematic view showing an example of the slitter 14. As shown in FIG. 1, tape supply means 1
In FIG. 3, the magnetic tape original 20 wound in a roll shape is attached to the hub 12 (core) of the rewind reel 11. The magnetic tape 20 is usually formed by forming a magnetic layer containing ferromagnetic fine particles on a nonmagnetic support by a coating method, a vacuum deposition method, or the like, and subjecting the magnetic layer to orientation treatment, drying treatment, surface treatment, and the like. Manufactured by. The slitter 14 is a device for cutting a wide and strip-shaped magnetic tape 20 into a plurality of magnetic tapes 26, 26,... By a pair of upper and lower rotary blades 30, 32. FIG.
As shown in FIG. 4, a thin disk shape is formed by applying shear force to the magnetic tape 20 between the plurality of rotating lower blades 30, 30... Formed in a roller shape as receiving blades and the rotating lower blade 30. The plurality of rotating upper blades 32, 32. The rotating lower blade 30 is fitted and fixed to the lower shaft 34 via a spacer 36, and the rotating upper blade 32 is attached to an upper shaft 38 parallel to the lower shaft 34 with a spacer 40.
Are fitted and fixed, and the blade tip portions of the rotating upper blade 32 and the rotating lower blade 30 are arranged so as to overlap each other.
The rotating upper blade 32 is urged to the right in the axial direction of FIG. 2 by a spring (not shown), and is positioned in a state in which the cutting edge portion of the rotating upper blade 32 is in contact with the cutting edge portion of the rotating lower blade 30. The upper shaft 38 and the lower shaft 34 are respectively connected to motors 41 and 43 whose rotation speeds can be freely changed, and the peripheral speeds of the rotary upper blade 32 and the rotary lower blade 30 can be individually changed. Between the rewinding reel 11 and the slitter 14, a plurality of guide rollers 21, 21,... Forming a conveying path for the magnetic tape original 20, and a groove for regulating the conveying speed of the magnetic tape original 20. A suction drum 24 is provided. The grooved suction drum 24 is connected to a motor (not shown) whose rotation speed can be freely changed. The grooved suction drum 24 attracts the magnetic tape 20 to the outer peripheral surface of the grooved suction drum 24 and rotates. The conveyance speed of the original fabric 20 is arbitrarily changed. The rotational speed of the hub 18 (core) of the take-up reel 17 in the tape take-up means 50 is controlled on the basis of the peripheral speed of the grooved suction drum 24. The means for regulating the conveyance speed of the magnetic tape original fabric 20 is not limited to the grooved suction drum 24, and a pinch roller for nipping and conveying the magnetic tape original fabric 20 can also be used. Slitter 14 and each take-up reel 1
In the magnetic tape conveying means 60 provided between the tension roller 28 and the plurality of roller members 22,
22,... Are provided. The tension in the transport direction of the original magnetic tape 20 at the time of cutting is arbitrarily adjusted by the tension roller 28. The magnetic tape transport unit 60 is provided with a cleaning unit C and the like as necessary as shown in the figure. FIG. 3 shows a magnetic tape manufacturing apparatus 10 according to the present invention.
3 is a configuration diagram of a roller member 22 used in the magnetic tape transport unit 60 of FIG. 4A is a perspective view showing a state in which a plurality of roller members 22, 22... Are mounted on the support shaft 23, and FIG. It is a fragmentary sectional view. The upper half is shown in section in FIG. The roller member 22 includes a boss 62 constituting an outer peripheral portion and a bearing 64 fitted to the inner periphery of the boss 62.
And a stopper ring 76 for preventing the bearing 64 from falling off, and an eddy current clutch 80. The boss 62 is composed of two members: a boss main body 62A which is a member disposed on the inner peripheral side and a crown ring 62B which is a member disposed on the outer peripheral side of the boss main body 62A. If comprised in this way, boss body 62A in which dimensional accuracy is required is constituted by, for example, a metal material,
Conveniently, the crown ring 62B, which requires control of hardness, crown shape, etc., can be made of, for example, a rubber material, a resin material, or the like. However, the boss body 62A and the crown ring 62B may be made of an integral material. Grooves 90, 90, 90 are formed on the outer peripheral surface of the boss 62 for removing air entrained by the magnetic tape 26. Also, the inner peripheral diameter of the bearings 64, 64 is the spindle 2
3 is a size that can be inserted. Here, at least one roller member 2 among the roller members 22, 22...
2 is required in the present invention to be provided with an eddy current clutch 80 as shown. FIG. 4 is a view showing the configuration of the eddy current clutch 80, (a) is a partially enlarged view of FIG. 3 (b),
(B) is the elements on larger scale which show the example of a structure different from this. In either case, the configuration of the roller member 22 corresponding to one magnetic tape 26 is shown. In FIG. 2A, a support shaft 23 (not shown).
A magnet holding ring 66 is fitted on (see FIG. 3A). Similarly, an inner ring 64 </ b> A of a bearing 64 is fitted to the support shaft 23. Therefore, the magnet holding rings 66 of all the roller members 22 and the inner ring 64 </ b> A of the bearing 64 rotate integrally with the support shaft 23. The width of the magnet holding ring 66 is formed so as to protrude laterally from the end face of the boss 62 (62A) so as to function as a spacer ring. A flange 70 is formed on the outer periphery in the vicinity of the right end portion of the magnet holding ring 66, and recesses are formed at equal intervals on the same circumference on the left side of the flange 70. In this recess, A magnet 68 is fitted. The flange 70 is preferably made of iron in order to prevent leakage of magnetic flux. On the other hand, on the right side of the inner periphery of the boss main body 62A,
Ring-shaped conductor plate 72 having substantially the same dimensions as the flange 70
Is arranged so as to face the magnet 68 at a predetermined interval. The conductor plate 72 is fixed to the right side of the inner peripheral portion of the boss main body 62A via an iron ring 74 for preventing magnetic flux leakage. The size and shape of the iron ring 74 are substantially the same as those of the conductor plate 72. The conductor plate 72 is made of copper or aluminum. The outer ring 64B of the bearing 64 is fitted to the inner peripheral portion of the boss main body 62A, and the conductor plate 72 and the iron ring 74 are fixed to the boss main body 62A as described above. Therefore, the boss main body 62 </ b> A, the conductor plate 72, and the iron ring 74 of each roller member 22 rotate integrally with the outer ring 64 </ b> B of the bearing 64. Further, these can rotate independently of the support shaft 23. With the configuration as described above, each boss body 62 is provided.
An eddy current clutch 80 is formed between A and the like and the support shaft 23. When the support shaft 23 of the roller member 22 is driven to convey the magnetic tape 26, each eddy current clutch 80 transmits the rotation to each boss body 62A. In the eddy current clutch 80, a magnet 68 that rotates together with the support shaft 23.
And the conductor plate 7 fixed to the boss main body 62A and opposed thereto.
In response to the relative motion with the eddy current, an eddy current is generated in the conductor plate 72. Each boss body 62 is attracted by the attractive force between the primary magnetic flux generated by the magnet 68 and the secondary magnetic flux generated by the eddy current generated in the conductor plate 72.
A is driven to rotate with a constant torque following the rotation of the support shaft 23. The torque of the eddy current clutch 80 is determined by the spindle 2
3 is proportional to the difference between the rotational speed of 3 and the rotational speed of each boss body 62A. For this reason, the difference in length of the magnetic tape 26 is 0.1%.
If there is, the rotational speed difference of the eddy current clutch 80 is also 0.1.
%, The applied tension is also suppressed by a difference of 0.1%, and the tension of each magnetic tape 26 becomes uniform. Thus, the tension applied to the magnetic tape 26 can be controlled by the eddy current clutch 80, and the tension of the plurality of magnetic tapes 26 can be made uniform. The configuration of the eddy current clutch 80 for controlling the tension is not limited to the above configuration, and the following configuration example can also be adopted. FIG. 4B shows an eddy current clutch 80 based on the same principle, but is slightly different in construction. In the figure, a flange 70, a conductor plate 72, and an iron ring 74 are shown.
Is formed in a wide and thin ring shape. However,
Each function is substantially the same as that of the structure shown by the figure (a). In each of the above two examples, the magnet 68 is fixed to the support shaft 23 side, and the conductor plate 72 and the iron ring 74 are fixed to the boss main body 62A side. is there. The position in the radial direction of the roller member 22 where the eddy current clutch 80 is disposed is not particularly limited. In addition, for example, Japanese Patent Laid-Open No. 2000-185.
The eddy current clutch etc. which are indicated by 850 gazette can also be adopted. As a means for extracting the eddy current generated in the conductor plate 72 to the outside, various known means such as a slip ring can be employed. Next, a method for controlling the tension of the magnetic tape 26 will be described. The magnetic tape manufacturing apparatus 10 is provided with tension detecting means (not shown) for each magnetic tape 26. This tension detecting means employs a known configuration and is generally called a tension pick or the like. Based on the tension of each magnetic tape 26 detected by the tension detecting means, feedback control is performed on the rotational speed of the support shaft 23 so that the tension of each magnetic tape 26 is equalized to a desired value. A so-called open control configuration can also be employed. FIG. 5 is a structural view of the roller member 22 that is not provided with the eddy current clutch 80 and can be used in the conveying means 60, and corresponds to FIG. 3 (b). The upper half is shown in cross section. In addition, the same code | symbol is attached | subjected about the member similar to FIG. 3, and the description is abbreviate | omitted. Roller member 2
2 is a boss 62 constituting an outer peripheral portion, a bearing 64,
64 and a spacer ring 82 for adjusting the gap between the adjacent roller members 22 and a stopper ring 76. Grooves 90, 90, 90 are formed on the outer peripheral surface of the boss 62 in order to eliminate air accompanying the magnetic tape 26. The inner diameters of the bearings 64 and 64 are sized so as to be fitted into the support shaft 23. Here, at least one roller member 2 of the roller members 22, 22...
It is preferable that the outer peripheral surface of No. 2 is formed in a medium height. "Medium-high" or "crown" is defined by the winding transmission means in the mechanics, and the rim surface of the belt wheel is formed in a convex shape in order to automatically prevent the belt from coming off. Refers to that. It is said that there are contours using arcs, two conical surfaces, and a conical surface sandwiching a cylindrical surface (machine terminology dictionary, Corona, 1986). Even if the belt (mainly flat belt) wound around the belt wheel is offset, the belt moves toward the larger diameter as the belt wheel rotates. Therefore, if the diameter of the central portion in the width direction of the belt wheel is formed larger than the diameter of the end portion in the width direction, the belt moves to the central portion in the width direction of the belt wheel and is stabilized as the belt wheel rotates. The above operation is similarly applied to the combination of the roller member 22 and the magnetic tape 26 of the magnetic tape manufacturing apparatus 10. The outer peripheral surface of the roller member 22 is JIS K6.
It is preferably formed of a material having a hardness defined by 301A in a range of 30 to 95, and a hardness of 60 to 90.
More preferably, it is made of a material in the range. This is because if the hardness is less than 30, the mid-high of the outer peripheral surface of the roller member 22 is deformed and the mid-high effect cannot be exhibited, and if the hardness exceeds 95, the magnetic tape 26 tends to be scratched and both are inappropriate. The radius of curvature of the outer peripheral surface of the roller member 22 is 4 m.
The range of 50-100 mm is preferable with respect to the magnetic tape of m width, and the range of 50-85 mm is more preferable. Also,
50 for 30 mm (1.2 inch) wide magnetic tape
A range of 0 to 2000 mm is preferable, 1000 to 200.
A range of 0 mm is more preferable. Thus, the optimum range according to the width of the magnetic tape 26 has been confirmed by experiments. As described above, the configuration in which the outer peripheral surface of the roller member 22 has an arc-shaped cross section has been described. However, the middle-high shape is not limited to this, and a trapezoidal cross section, a rectangular cross section, an elliptical cross section,
Various cross-sectional shapes such as a hyperbolic cross-section, a combination of two conical surfaces, and a conical surface sandwiching a cylindrical surface can be adopted. What is the composition ratio between the roller member 22 not provided with the eddy current clutch 80 and the roller member 22 provided with the eddy current clutch 80 shown in FIGS. This may be optimized depending on the width of the magnetic tape 26, the material of the magnetic tape 26, manufacturing conditions, and the like. The roller member 22 provided with the eddy current clutch 80 shown in FIGS. 3 and 4 is formed to have a middle or high outer peripheral surface or a structure shown in FIG. Of course it can be adopted. The positions, the number, etc. of the roller members 22, 22... Arranged on the magnetic tape transport means 60 are not limited to the illustrated configuration, and various modes can be adopted. Moreover, even if the outer peripheral surface of the roller member 22 is not formed at a medium height, the effect of the present invention can be obtained. Next, the operation of the magnetic tape manufacturing apparatus 10 constructed as described above will be described. First, the roll-shaped magnetic tape raw material 20 wound around the rewinding reel 11 of the tape supply means 13 is continuously drawn out from the rewinding reel 11 and conveyed to the slitter 14. And slitter 1
4 is cut into a plurality of magnetic tapes 26, and the conveying path 60 is cut.
Are wound around the hub 18 of the take-up reel 17 of the tape take-up means 50. Thereby, for example, the magnetic tape original fabric 20 is 100 to 500.
It is cut into a book and has a specified width dimension (for example, 12.65 mm,
25.4 mm, 3.81 mm, etc.) is produced. In this series of steps, at least one of the roller members 22, 22...
Since one roller member 22 is provided with an eddy current clutch 80 and the tension of the magnetic tape 26 being conveyed can be controlled, even if there is a slight variation in the length of the magnetic tape, the magnetic tape There is no problem caused by sagging of slack. As described above, according to the present invention,
A plurality of roller members having an eddy current clutch are mounted on at least one of the support shafts of the magnetic tape transport means provided between the slitter and the tape take-up means. Since the tension of the magnetic tape can be controlled, the tension of each magnetic tape can be made uniform, the productivity and product quality can be stabilized and improved, and the yield can be improved. Further, according to the present invention, a drive source (for example, a motor) is not required, and a space required for wiring and the like is not required, resulting in an advantage that space saving can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a magnetic tape manufacturing apparatus used in the present invention. FIG. 2 is a side view of a slitter. FIG. 3 is a roller used in a magnetic tape manufacturing apparatus of the present invention. FIG. 4 is a block diagram of the main part of the eddy current clutch. FIG. 5 is a block diagram of another embodiment of the roller member. DESCRIPTION OF SYMBOLS 10 ... Magnetic tape manufacturing apparatus, 11 ... Rewinding reel, 1
3 ... tape supply means, 14 ... slitter (cutting device), 1
7 ... take-up reel, 18 ... hub (core), 20 ... original magnetic tape, 22 ... roller member, 26 ... magnetic tape, 50 ...
Tape winding means, 60 ... magnetic tape conveying means, 80 ...
Eddy current clutch

Claims (1)

[Claims] [Claims] [Claim 1] Tape supply means for pulling out a wide strip-shaped magnetic tape wound in a roll shape from the feed side, and said magnetic tape original into a plurality of narrow magnetic tapes A slitter for cutting, a tape winding means for individually winding the magnetic tape on a winding core, and a slit provided between the slitter and the tape winding means. A magnetic tape transport device that guides to the tape take-up device while being supported by a roller member mounted on the magnetic tape, and at least one of the support shafts of the magnetic tape transport device.
A plurality of roller members containing an eddy current clutch are mounted on one spindle, and the tension of the magnetic tape being conveyed can be controlled by controlling the rotation of the spindle. Magnetic tape manufacturing equipment.